XML 35 R25.htm IDEA: XBRL DOCUMENT
v3.21.1

Allowance for Loan Losses (Details 4) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Beginning Balance | $ 4,206 | $ 4,194
Added | 426 | 154
Charged Off | (43) | (41)
Payments | (125) | (151)
Ending Balance | 4,464 | 4,156
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Beginning Balance | 0 | 11
Added | 0 | 0
Charged Off | 0 | 0
Payments | 0 | (7)
Ending Balance | 0 | 4
Residential Portfolio Segment [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Beginning Balance | 3,589 | 3,485
Added | 378 | 60
Charged Off | 0 | (6)
Payments | (79) | (101)
Ending Balance | 3,888 | 3,438
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Beginning Balance | 617 | 698
Added | 48 | 94
Charged Off | (43) | (35)
Payments | (46) | (43)
Ending Balance | $ 576 | $ 714

X
- Definition Financing Receivable, Impaired, Troubled Debt Restructuring, Additions During Period + References No definition available. + Details
Name: | thff_FinancingReceivableImpairedTroubledDebtRestructuringAdditionsDuringPeriod
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Impaired, Troubled Debt Restructuring, Payments During Period + References No definition available. + Details
Name: | thff_FinancingReceivableImpairedTroubledDebtRestructuringPaymentsDuringPeriod
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |